About the book: year / The Hardy brothers, Frank and Joe, live in the American town of Bayport. In their free time from school, they enjoy helping their father, the famous detective Mr. Hardy, solve criminal crimes. It often happens that Frank and Joe give a hundred points ahead to Mr. Hardy. This time, the brothers expose a gang of counterfeiters and, at the same time, help their father put behind bars a man who carried out sabotage at secret enterprises..